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My opponent has a werewolf transforming card in play, currently with the human side face up.

I have a sliver in my hand with sliver cycling. I cycle this sliver to find another in my deck. The one in my hand therefore goes into my graveyard. I end my turn after revealing my chosen sliver and placing it in my hand.

My opponent wants to transform his werewolf, claiming I cast no spells.

I payed mana, a card left my hand and entered my graveyard. Was that a spell?

To be strict, you didn't actually "draw" the sliver: it won't trigger any abilities that look for a draw. Unlike most forms of cycling, with slivercycling you don't draw a card, you choose a sliver from your library and put it in your hand. I know that's likely what you meant, but MtG terminology is important and I don't want readers to be confused.
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ghoppeFeb 27 '12 at 16:04